// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TEST_SIMPLE_TEST_CLOCK_H_
#define BASE_TEST_SIMPLE_TEST_CLOCK_H_

#include "base/compiler_specific.h"
#include "base/synchronization/lock.h"
#include "base/time/clock.h"
#include "base/time/time.h"

namespace base {

// SimpleTestClock is a Clock implementation that gives control over
// the returned Time objects.  All methods may be called from any
// thread.
class SimpleTestClock : public Clock {
public:
    // Starts off with a clock set to Time().
    SimpleTestClock();
    ~SimpleTestClock() override;

    Time Now() override;

    // Advances the clock by |delta|.
    void Advance(TimeDelta delta);

    // Sets the clock to the given time.
    void SetNow(Time now);

private:
    // Protects |now_|.
    Lock lock_;

    Time now_;
};

} // namespace base

#endif // BASE_TEST_SIMPLE_TEST_CLOCK_H_
